dbaett9 dbaett9
  • 25-07-2017
  • Mathematics
contestada

simplify sin(2x+7y)+sin(2x-7y)

Respuesta :

amirreza688 amirreza688
  • 29-07-2017
sin(a+b)=sin a * cos b + sin b cos a
sin(a-b)=sin a * cos b - sin b cos a
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